(1991) This size was not popular with the individual themes of the 1990s. It only made an appearance three times after Futuron. It skipped Blacktron, Space Police and M:tron and this is its first appearance for Blacktron 2.

(1996) This is the final time that the set size appeared for the Space subtheme in the number range. The set number 6853 was not used suggesting that there was probably a Spyrius set in the range that never made it out commercially.